[Bug] up/down chevron alignment

[langermank]

Closes https://github.com/github/primer/issues/1673

This PR adjusts where the SVG sits within the frame to improve horizontal alignment between these related icons.

Before

After

Concerns

• Will this break how the icons behave individually? This might be considered an edge case where they appear side by side
• Should we take another approach to handle this at the component level?

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: fadb376171ef353440d9c292d0e5280d572af138

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------------- | ----- | | @primer/octicons | Patch |

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[gavinmn]

Going to add this to the Octicons agenda for next Wednesday.

[langermank]

Here's a preview of how these changes will impact Primer React https://primer-3ab97043a8-13348165.drafts.github.io/storybook/?path=/story/components-iconbutton-features--chevron-test